<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8" />
    <title>React 实例</title>
    <script src="https://cdn.staticfile.org/react/16.4.0/umd/react.development.js"></script>
    <script src="https://cdn.staticfile.org/react-dom/16.4.0/umd/react-dom.development.js"></script>
    <script src="https://cdn.staticfile.org/babel-standalone/6.26.0/babel.min.js"></script>
</head>
<body>
<div id="example"></div>

<script type="text/babel">
    function Mailbox(props) {
        const unreadMessages = props.unreadMessages;
        return (
            <div>
                <h1>Hello!</h1>
                {unreadMessages.length > 0 &&
                <h2>
                    您有 {unreadMessages.length} 条未读信息。
                </h2>
                }
            </div>
        );
    }

    const messages = ['React', 'Re: React', 'Re:Re: React'];
    ReactDOM.render(
        <Mailbox unreadMessages={messages} />,
        document.getElementById('example')
    );
</script>

</body>
</html>